In a bending moment diagram, what does a positive bending moment indicate?

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Question: In a bending moment diagram, what does a positive bending moment indicate?

Options:

Correct Answer: Beam is sagging

Solution:

A positive bending moment indicates that the beam is sagging, meaning the top fibers are in compression and the bottom fibers are in tension.

In a bending moment diagram, what does a positive bending moment indicate?

In a bending moment diagram, what does a positive bending moment indicate?

Step 1: Understand what a bending moment is. It is a measure of the internal forces in a beam when it is subjected to loads.
Step 2: Learn about the bending moment diagram. It visually represents how the bending moment varies along the length of the beam.
Step 3: Identify what a positive bending moment means. A positive value on the diagram indicates that the beam is bending downwards in the middle.
Step 4: Recognize the effect of this bending. When the beam sags, the top part of the beam gets compressed (squished together) and the bottom part gets stretched (pulled apart).
Step 5: Conclude that a positive bending moment shows that the beam is experiencing sagging.

Bending Moment – A measure of the internal moment that induces bending in a beam, indicating how the beam will deform under load.
Positive Bending Moment – Indicates that the beam is sagging, with the top fibers experiencing compression and the bottom fibers experiencing tension.